Any skilful play that gains extra points in the endgame, in comparison with more normal moves, may deserve to be called tesuji. It is also interesting to play in such a way as to take sente rather than end in gote.
Here Black makes use of to jump further into White's territory; now White cannot answer at a. Black might miss this chance by playing
at a.
White answers at a and loses five stones.
is sente. If White plays
elsewhere, Black has a 3 point sente at a, as in the first example. If
is played as the hane at
, then White blocks at a, and Black connects at
, then Black loses sente.
See also: